Association of High Body Mass Index With Postoperative Complications After Chest Masculinization Surgery

Purpose Body mass index (BMI) requirements for transgender and nonbinary patients undergoing chest masculinization surgery (CMS) are not standardized and based on small sample sizes. This is the largest and first national retrospective study to determine the association between BMI and postoperative complications.Methods The National Surgical Quality Improvement Program 2012-2020 was queried for CMS patients. The primary outcome was incidence of at least one complication within 30 days. Secondary outcomes were incidence of major and minor complications. Body mass index (in kilograms per square meter) was categorized as category 0 (<30), 1 (30-34.9), 2 (35-39.9), 3 (40-44.9), 4 (45-49.9), and 5 (>= 50). Logistic regression was used to evaluate the association between BMI and outcomes.Results Of 2317 patients, median BMI was 27.4 kg/m(2) (interquartile range, 23.4-32.2 kg/m(2)). Body mass index range was 15.6 to 64.9 kg/m(2). While increasing BMI was significantly associated with greater odds of at least one complication, no patients experienced severe morbidity, regardless of BMI. Patients with BMI >= 50 kg/m(2) had an adjusted odds ratio [aOR, 95% confidence interval (CI)] of 3.63 (1.02-12.85) and 36.62 (2.96->100) greater odds of at least one complication and urinary tract infection compared with nonobese patients, respectively. Patients with BMI >= 35 kg/m(2) had an adjusted odds ratio (95% CI) of 5.06 (1.5-17.04) and 5.13 (1.89-13.95) greater odds of readmission and surgical site infection compared with nonobese patients, respectively.Conclusions Chest masculinization surgery in higher BMI patients is associated with greater odds of unplanned readmission. Given the low risk for severe complications in higher BMI individuals, we recommend re-evaluation of BMI cutoffs for CMS patients.